| What these numbers mean |
| 0-50 |
CODE GREEN:
Good |
Air is safe to breathe. |
| 51-100 |
CODE YELLOW:
Moderate |
Unusually sensitive people should consider limiting prolonged outdoor exertion. |
| 101-150 |
CODE ORANGE: Unhealthy for Sensitive Groups |
Active children and adults, and people with respiratory disease, such as asthma, should limit prolonged outdoor exertion. |
| 151-200 |
CODE RED:
Unhealhty
(Smog alert) |
Active children and adults, and people with respiratory disease, should avoid prolonged outdoor exertion; everyone else, especially children, should limit prolonged outdoor exertion. |
| 201-300 |
CODE PURPLE:
Very Unhealthy
(Smog alert) |
Active children and adults, and people with respiratory disease, such as asthma, should avoid outdoor exertion; everyone else, especially children, should limit outdoor exertion. |
| > 300 |
CODE BLACK:
Hazardous
(Smog alert) |
Everyone should avoid all outdoor exertion |
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